\section{Conclusion}
In this paper we have presented a selection of tools which aim to reduce manual labor during ontology creation and maintenance. We have seen that many such tools do exist, and some - e.g. Prot\'{e}g\'{e} - are widely used. Additionally to available open-source solutions, commercial applications have emerged. One of the main focuses of these commercial ontology editors is inferencing. Due to the rapid growth of communities in research and industry who have an interest in creating and using ontologies, the collaborative approach, which enables anyone to create and modify ontologies - as opposed to one or a few individuals - is promising.

However, we find that there is room for improvement regarding the useability and ease-of-use of the presented tools, especially the browser based tools which we presented in section~\ref{tools-collaborative}. Additionally, it would be nice to see a stronger support for unintrusive user-assistance (a popular example of unintrusive user-assistance would be Google's ``Did you mean \ldots'' suggestions) which could also take already existing ontologies in account to reduce duplicate effort.